CN101146989B - Exhaust system with an exhaust gas treatment unit and a heat exchanger in an exhaust recycle line - Google Patents
Exhaust system with an exhaust gas treatment unit and a heat exchanger in an exhaust recycle line Download PDFInfo
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- CN101146989B CN101146989B CN2006800096065A CN200680009606A CN101146989B CN 101146989 B CN101146989 B CN 101146989B CN 2006800096065 A CN2006800096065 A CN 2006800096065A CN 200680009606 A CN200680009606 A CN 200680009606A CN 101146989 B CN101146989 B CN 101146989B
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- heat exchanger
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- down process
- process element
- exhaust
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 73
- 239000000919 ceramic Substances 0.000 claims description 14
- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 27
- 238000009826 distribution Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000002349 favourable effect Effects 0.000 description 8
- 238000000265 homogenisation Methods 0.000 description 8
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- 230000008520 organization Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 239000000659 freezing mixture Substances 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052766 Lawrencium Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000006262 metallic foam Substances 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 150000002738 metalloids Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
- F01N3/2889—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with heat exchangers in a single housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Exhaust Gas After Treatment (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
An exhaust gas system for an internal combustion engine includes an intake system and an exhaust outlet interconnected by an exhaust gas recirculation line having an exhaust treatment unit and a heat exchanger. The heat exchanger has a first back pressure and the exhaust treatment unit has a second back pressure, smaller than the first back pressure. The exhaust treatment unit is disposed at such a first distance from the heat exchanger in flow direction that, during operation, a gas flow entering the exhaust treatment unit is homogenized. The exhaust gas system permits an advantageous configuration of a heat exchanger and an exhaust treatment unit, such as for example a honeycomb body in the exhaust gas recirculation line, in which both the heat exchanger and the exhaust treatment unit can have a smaller structure than in conventional systems. This reduces costs considerably for equipping such a system.
Description
Technical field
Theme of the present invention is a kind of internal-combustion engine vent systems that has heat exchanger and pump-down process element in exhaust gas recirculation passages.
Background technique
The vent systems of internal-combustion engine is configured with heat exchanger usually, and this heat exchanger is used for coolant exhaust especially when exhaust gas recirculatioon is to the air inlet zone of internal-combustion engine.The pollution of the heat exchanger that is caused by the harmful matter that exists in the exhaust can reduce its working efficiency, makes must carry out the over dimensioning design to heat exchanger basically, so that guarantee that in the long time heat exchanger has specified working efficiency at least.
In order to reduce the pollution of heat exchanger, can dispose catalyst converter in the upstream of heat exchanger from prior art is known, this catalyst converter can be removed at least and can cause that formation adheres to sedimentary long chain hydrocarbon in heat exchanger.Such system has following shortcoming: although or be to be provided with catalyst converter in the upstream, only carried out not enough exhaust and transformed, therefore the pollution of heat exchanger still can take place; Or in order to stop the pollution of heat exchanger effectively, thereby catalyst converter must have king-sized size.
Summary of the invention
Therefore, the objective of the invention is to, a kind of system that is installed in the exhaust gas recirculation passages is provided, and this system comprises a heat exchanger and a catalyst converter, and the pollution that can reduce heat exchanger in this system effectively also realizes the as far as possible little structural volume of heat exchanger and catalyst converter simultaneously.
Described purpose is realized by vent systems hereinafter described.Hereinafter give other favourable organization plan of described vent systems.
According to internal combustion engine exhaust system of the present invention, this internal-combustion engine comprises gas handling system and exhaust passage, wherein the exhaust passage links to each other by exhaust gas recirculation passages with gas handling system, in this exhaust gas recirculation passages, dispose pump-down process element and heat exchanger, wherein heat exchanger has first back pressure and the pump-down process element has second back pressure littler than first back pressure, it is characterized in that, the pump-down process element is configured in the upstream of heat exchanger with such first apart from streamwise, makes that to enter the air-flow of pump-down process element at run duration homogenized.This means especially, and what first back pressure of heat exchanger can influence the pump-down process element is positioned at the back pressure of upstream along airflow direction.
Here, heat exchanger is meant the vent gas cooler that is used to cool off exhaust gas recirculation especially.Internal-combustion engine is meant diesel engine especially, for example (for example, passenger car, load-carrying vehicle, two-wheeled vehicle, ship or the aircraft) diesel engine of motor vehicle or the diesel engine that uses in the fixed position.Homogenization is meant the probability distribution of widening desired speed especially.
Compare with the pump-down process element, the structural type of heat exchanger has been determined the back pressure that is improved.Preferred especially a kind of heat exchanger, this heat exchanger have a plurality of exhausts by its pipeline that flows.Preferably, freezing mixture flows around these pipelines, and this freezing mixture circulates in heat exchanger shell, and this freezing mixture is obtained from unshowned internal-combustion engine cooling circuit.Honeycomb ceramics, for example pottery or metallic honeycomb bodies, or wire dictyosome, metal foam body or like are suitable for especially as the pump-down process element.Metallic honeycomb bodies can be especially locally at least be formed the metal layer of structure and may constitute by at least one smooth basically layer by at least one, and these layers twine mutually or heap also links together.The layer that interconnects or twine has constituted the negotiable cavity of fluid that is limited by described layer.For example aluminum steel or chromium steel form by the material of high-temperature corrosion resistance especially for described layer.Described layer can interconnect with the material ways of connecting especially by for example high-temperature soldering method.Not only smooth basically layer but also the local at least layer that forms structure can have microstructure, section, through hole and/or perforation at least in the part, these structures are as air-flow can be mixed better.
The homogenization that enters pump-down process element air-flow is before carried out in an advantageous manner, and promptly the pump-down process element is arranged on the upstream of heat exchanger than near-earth.This causes the homogenization of the air-flow that enters the pump-down process element, owing to exhaust acts on the cross section of pump-down process element equably, so improved conversion ratio.Therefore, compare with common structure, under the condition that the conversion ratio of harmful matter is identical in exhaust, the volume of this pump-down process element can reduce.The harmful matter conversion ratio significantly improve the pollution that has also reduced heat exchanger, therefore compare with traditional heat exchanger, this heat exchanger can have littler size.
In order to construct the pump-down process element that only has less back pressure, can use honeycomb ceramics with less element number, this element number for example is less than 400cpsi (unit/square inch), preferably is less than 300cpsi, preferred especially 200cpsi and especially even less than 100cpsi.
According to one of vent systems of the present invention favourable design proposal, select first distance that the effect of the win back pressure and second back pressure is accumulated.
The accumulation here is meant that especially the back pressure that is present in pump-down process element upstream is higher than second back pressure that this pump-down process element itself has.Back pressure in member upstream in air-flow can form a kind of pressure buffer, and this pressure buffer causes that air-flow changes.Under extreme case, above-mentioned invention can bring a kind of situation, wherein, only forms a pressure buffer in the upstream of pump-down process element, rather than forms the zone that respectively has a pressure buffer in the upstream of heat exchanger and waste gas treatment element respectively.
The accumulation of back pressure causes exhaust must overcome the back pressure bigger than second back pressure of pump-down process element in an advantageous manner before entering the pump-down process element.Different according to the setting type of heat exchanger and pump-down process element, this back pressure even significantly greater than second back pressure.The increase of back pressure causes the homogenization of the air-flow of pump-down process element, and and then causes homogenization by the air-flow of pump-down process element and heat exchanger.
According to another favourable design proposal, the second distance of heat exchanger air inlet side end face is arrived less than 60mm, preferably less than 45mm, particularly preferably less than 30mm in pump-down process element air inlet side end face.
These parameters are proved to be particularly advantageous.Particularly under common operating conditions, the effect of first and second back pressures is accumulated.
According to another the favourable organization plan by vent systems of the present invention, the length of pump-down process element on flow direction is less than 100mm, preferably less than 50mm, particularly preferably less than 25mm or littler.
Owing to can transform respective substance in the exhaust very equably, effectively, for example therefore hydrocarbon can use less pump-down process element.
According to another favourable organization plan of vent systems of the present invention, the pump-down process element comprises honeycomb ceramics.
Utilize honeycomb ceramics can make a kind of pump-down process element, the characteristic of this pump-down process element can be carried out point-device adjustment as surface, back pressure etc.Pottery or metallic honeycomb bodies are particularly suitable for as honeycomb ceramics.Particularly can advantageously use for example DE19755703A1, the honeycomb ceramics described in WO90/13736A1 and the WO99/11911A1.About fixing of honeycomb ceramics, please refer to the full text of these publications.
According to another favourable organization plan of vent systems of the present invention, the distance of first between pump-down process element and the heat exchanger is less than 15mm, preferably less than 10mm, particularly preferably less than 5mm.
It is particularly advantageous being installed in heat exchanger and pump-down process element in the common housing.At this moment, the pump-down process element can be maintained in the corresponding recesses of housing by means of flange or similar structure.Also can be installed in the pump-down process element simply the end face of heat exchanger.
According to another favourable organization plan of vent systems of the present invention, the pump-down process element comprises catalytically active coatings, particularly the oxidation catalysis coating.
Catalytically active coatings comprises for example ceramic monolith coating (Washcoat), this ceramic monolith coating comprises the material of the desired reaction of catalysis especially, being described material is reduced to the reaction temperature of these reactions to a certain degree, makes that described reaction is carried out with considerable degree under the temperature in exhaust gas recirculation passages.Precious metal, for example platinum, lawrencium or metalloid are especially suitable for use as catalyzer.The oxidation catalysis coating is the oxidation of catalytic hydrocarbon especially, because these hydrocarbons are sources of the pollution of heat exchanger.Hydrocarbon forms a kind of stickum, and the condensation in the cool region of heat exchanger of this material also can cause further that the carbon granule that is included in the exhaust is attached on the heat exchanger wall.OXIDATION OF HYDROCARBONS is also carried out in particularly advantageous mode, makes the pollution of heat exchanger significantly reduce.In the vent systems of diesel engine, because the oxygen content in the exhaust is higher, OXIDATION OF HYDROCARBONS can be very widely until carrying out fully especially.
In order to reach the transformation efficiency of high as far as possible oxidizing hydrocarbon, designing and arranging gas disposal element especially makes the waiting time long as much as possible and can be big as much as possible for the surface area of reaction use.
According to another favourable organization plan of vent systems of the present invention, the ratio of first back pressure and second back pressure is preferably more than 10 greater than 2.
Especially under the situation of these back pressure ratios, that is to say back pressure when heat exchanger itself be pump-down process element itself back pressure more than 2 times or even more than 10 times the time, when first distance be 15mm or more in short-term, the effect of first back pressure of heat exchanger and second back pressure of pump-down process element is just accumulated.
Description of drawings
Explain the present invention in detail by means of accompanying drawing below, rather than limit the present invention in the embodiment and advantage of shown and description.In the accompanying drawings:
Fig. 1 is the schematic representation according to first embodiment of vent systems of the present invention;
Fig. 2 is the partial schematic diagram according to first embodiment of vent systems of the present invention;
Fig. 3 is the partial schematic diagram according to second embodiment of vent systems of the present invention;
Fig. 4 is the schematic representation of two probability distribution of flow velocity.
Embodiment
Fig. 1 schematically illustrates first embodiment according to vent systems 1 of the present invention of internal-combustion engine 2.Internal-combustion engine 2 comprises a gas handling system 3 and an exhaust passage 4, and wherein exhaust passage 4 is connected by exhaust gas recirculation passages 5 with gas handling system 3, disposes a pump-down process element 6 and a heat exchanger 7 in this exhaust gas recirculation passages.Heat exchanger 7 has first back pressure, and pump-down process element 6 has second back pressure littler than first back pressure.The common flow direction of exhaust is represented by corresponding arrow.The air displacement of the exhaust gas recirculation passages of flowing through 5 can for example be regulated by unshowned corresponding valve.Exhaust gas recirculation passages 5 also can be told from the upstream or the downstream of unshowned exhaust turbo-supercharging machine at exhaust side.
According to the present invention, pump-down process element 6 is arranged in the upstream of heat exchanger 7 with such first distance, 8 streamwises, makes that to enter the air-flow 14 of pump-down process element 6 at run duration homogenized.Here, first distance 8 is especially less than 15mm, preferably less than 10mm, particularly preferably less than 5mm.Heat exchanger 7 and pump-down process element 6 are arranged such that in the effect accumulation of (distance between this heat exchanger and the pump-down process element is) first distance 8: first back pressures and second back pressure, make the exhaust that flows into pump-down process element 6 must overcome the back pressure greater than second back pressure of pump-down process element 6.As mentioned above, this causes the homogenization of the air-flow 14 that flows into pump-down process element 6.
Fig. 2 schematically illustrates the part figure of the exhaust gas recirculation passages 5 that comprises pump-down process element 6 and heat exchanger 7.According to the present invention, be chosen in the second distance 9 between the air inlet side end face 11 of the air inlet side end face 10 of heat exchanger 7 and pump-down process element 6, make the homogenization that is implemented in the air-flow in the pump-down process element 6.Second distance 9 is less than 60mm, preferably less than 45mm, particularly preferably less than 30mm especially.Can use short honeycomb ceramics especially, particularly the length on flow direction 12 is about honeycomb ceramics of 20 to about 40mm, as pump-down process element 6.For example, first distance 8 is less than 15mm, or 5mm or littler.Select first distance 8 especially, make the effect of second back pressure of first back pressure of heat exchanger 7 and pump-down process element 6 accumulate mutually, thereby the exhaust that make to flow into pump-down process element 6 must overcome a back pressure, this back pressure greater than, be preferably significantly second back pressure greater than pump-down process element 6.
Fig. 3 schematically illustrates the part figure according to another embodiment of vent systems 1 of the present invention.Here, structure one cone 13 comprises the pump-down process element 6 that is presented as the honeycomb ceramics 17 with tapered channel 18 in this cone in exhaust gas recirculation passages 5.Cone 13 will be flowed through in air-flow 14 delivery heat exchangers 7 of exhaust gas recirculation passages 5.Heat exchanger 7 comprises the outlet pipe 15 in the housing 16.Air-flow 14 outlet pipe 15 of flowing through, wherein the freezing mixture as internal-combustion engine 2 cooling circuit parts flows around this outlet pipe 15 in housing 16.According to the present invention, select first between heat exchanger 7 and the pump-down process element 6 apart from 8, make that to enter the air-flow 14 of pump-down process element 6 at run duration homogenized.
Fig. 4 schematically illustrates first probability distribution 19 of speed v and second probability distribution 20 of speed v.When gas only flows through pump-down process element 6, when just in pump-down process element 6 downstreams heat exchanger 7 not being set along airflow direction, first probability distribution 19 appears.For two kinds of distributions, be illustrated in the probability of certain speed that exists in the exhaust.Probability and speed all provide with relative unit.Second probability distribution 20 is the probability distribution according to system of the present invention.Also promptly this probability distribution relates to the vent systems 1 that has heat exchanger 7 and pump-down process element 6 in exhaust gas recirculation passages 5.Wideer with respect to first probability distribution, 19, the second probability distribution 20, have bigger width (half range overall with/halfwidth (full width half maximum)) especially at half place of maximum height.This is because the present invention is formed to the homogenization of air-flow.
Allow in exhaust gas recirculation passages 5, to form the pump-down process element 6 of heat exchanger 7 and for example honeycomb ceramics in particularly advantageous mode according to vent systems of the present invention, wherein, not only heat exchanger 7 but also pump-down process element 6 can to design than common form little.This provides cost savings when this type systematic of design significantly.
Reference numerals list
1 gas extraction system
2 internal combustion engines
3 gas handling systems
4 exhaust passages
5 exhaust gas recirculation passages
6 pump-down process elements
7 heat exchangers
8 first distances
9 second distances
The air inlet side end face of 10 heat exchangers
The air inlet side end face of 11 pump-down process elements
12 length
13 cones
14 air-flows
15 outlet pipes
16 housings
17 honeycomb ceramicss
18 passages
19 first probability distribution
20 second probability distribution
Claims (8)
1. the vent systems (1) of an internal-combustion engine (2), this internal-combustion engine comprises gas handling system (3) and exhaust passage (4), wherein exhaust passage (4) are connected by exhaust gas recirculation passages (5) with gas handling system (3), in this exhaust gas recirculation passages, dispose a pump-down process element (6) and a heat exchanger (7), wherein heat exchanger (7) has first back pressure, pump-down process element (6) has second back pressure littler than first back pressure, it is characterized in that, pump-down process element (6) is arranged in the upstream of heat exchanger (7) with such first distance (8) streamwise, makes that to enter the air-flow (14) of pump-down process element (6) at run duration homogenized.
2. according to the described vent systems of claim 1 (1), it is characterized in that: select first distance (8), make the effect accumulation of the win back pressure and second back pressure.
3. according to claim 1 or 2 described vent systems (1), it is characterized in that: the air inlet side end face (11) of pump-down process element (6) to the second distance (9) of the air inlet side end face (10) of heat exchanger (7) less than 60mm.
4. according to the described vent systems of claim 1 (1), it is characterized in that: the length (12) of pump-down process element (6) on flow direction is less than 100mm.
5. according to the described vent systems of claim 1 (1), it is characterized in that: the distance of first between pump-down process element (6) and the heat exchanger (7) (8) is less than 15mm.
6. according to the described vent systems of claim 1 (1), it is characterized in that: pump-down process element (6) comprises a honeycomb ceramics (17).
7. according to the described vent systems of claim 1 (1), it is characterized in that: pump-down process element (6) comprises a catalytically active coatings.
8. according to the described vent systems of claim 1 (1), it is characterized in that: the ratio of first back pressure and second back pressure is greater than 2.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005014264.8 | 2005-03-24 | ||
| DE102005014264A DE102005014264A1 (en) | 2005-03-24 | 2005-03-24 | Exhaust system with an exhaust gas treatment unit and a heat exchanger in an exhaust gas recirculation line |
| PCT/EP2006/002702 WO2006100090A1 (en) | 2005-03-24 | 2006-03-24 | Exhaust system with an exhaust gas treatment unit and a heat exchanger in an exhaust recycle line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101146989A CN101146989A (en) | 2008-03-19 |
| CN101146989B true CN101146989B (en) | 2010-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800096065A Active CN101146989B (en) | 2005-03-24 | 2006-03-24 | Exhaust system with an exhaust gas treatment unit and a heat exchanger in an exhaust recycle line |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US7490595B2 (en) |
| EP (1) | EP1861608B1 (en) |
| JP (1) | JP2008534835A (en) |
| KR (1) | KR100901548B1 (en) |
| CN (1) | CN101146989B (en) |
| DE (1) | DE102005014264A1 (en) |
| PL (1) | PL1861608T3 (en) |
| RU (1) | RU2410561C2 (en) |
| WO (1) | WO2006100090A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2925608A3 (en) * | 2007-12-19 | 2009-06-26 | Renault Sas | Low-pressure exhaust gas recirculation device for internal combustion engine, has cooler including housing comprising filtration element that filters non-combustible particles of gas and is inclined with respect to gas flow direction |
| JP4966290B2 (en) * | 2008-12-17 | 2012-07-04 | 本田技研工業株式会社 | Exhaust gas recirculation device for internal combustion engine |
| CN102784524B (en) * | 2011-05-20 | 2014-12-10 | 雅高思先进科技有限公司 | High-performance air cleaning device and method |
| JP5863320B2 (en) | 2011-08-05 | 2016-02-16 | 三菱重工コンプレッサ株式会社 | Centrifugal compressor |
| DE102013000766A1 (en) | 2013-01-18 | 2014-07-24 | Man Diesel & Turbo Se | cooler |
| CN106444234A (en) * | 2016-09-21 | 2017-02-22 | 苏州佳世达光电有限公司 | Projection apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29513957U1 (en) * | 1995-08-31 | 1997-01-09 | Robert Bosch Gmbh, 70469 Stuttgart | Exhaust pipe arrangement of an internal combustion engine, in particular for a combined heat and power plant |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8905415U1 (en) | 1989-04-28 | 1990-08-30 | Emitec Gesellschaft für Emissionstechnologie mbH, 5204 Lohmar | Metallic catalyst carrier body fixed in a partition wall |
| US5785030A (en) * | 1996-12-17 | 1998-07-28 | Dry Systems Technologies | Exhaust gas recirculation in internal combustion engines |
| JPH10238414A (en) * | 1997-02-28 | 1998-09-08 | Isuzu Motors Ltd | Control device for egr |
| DE19755703B4 (en) | 1997-12-15 | 2008-03-13 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Catalyst support arrangement for installation close to the engine |
| JP2001515168A (en) | 1997-09-03 | 2001-09-18 | エミテク・ゲゼルシャフト・フュール・エミシオーンテクノロギー・ミット・ベシュレンクテル・ハフツング | Catalyst support arrangement for installation near the engine |
| JP2000146465A (en) | 1998-09-03 | 2000-05-26 | Usui Internatl Ind Co Ltd | Method for preventing adhesion of foreign object in exhaust gas recirculation burning system |
| JP2000130269A (en) * | 1998-10-23 | 2000-05-09 | Hino Motors Ltd | Catalyst bult-in muffler of engine with exhaust gas recirculating device |
| JP3937635B2 (en) * | 1999-03-01 | 2007-06-27 | いすゞ自動車株式会社 | EGR cooler with exhaust gas purification function |
| DE19923781C2 (en) * | 1999-05-22 | 2001-04-26 | Degussa | Method and device for removing soot from the exhaust gas of a diesel engine |
| JP2001027157A (en) * | 1999-07-13 | 2001-01-30 | Mitsubishi Motors Corp | Strut for egr cooler |
| SE520972C2 (en) * | 2001-12-06 | 2003-09-16 | Stt Emtec Ab | Device for cleaning its exhaust gases in an internal combustion engine |
| JP2003336549A (en) * | 2002-05-20 | 2003-11-28 | Denso Corp | Egr device for internal combustion engine |
| US6851414B2 (en) * | 2002-07-30 | 2005-02-08 | Exxonmobil Research And Engineering Company | Method and system to extend lubricant life in internal combustion EGR systems |
| BRPI0414441A (en) * | 2003-09-18 | 2006-11-14 | Behr Gmbh & Co Kg | exhaust gas heat exchanger, in particular exhaust gas cooler for exhaust gas recirculation in motor vehicles |
| US7013879B2 (en) * | 2003-11-17 | 2006-03-21 | Honeywell International, Inc. | Dual and hybrid EGR systems for use with turbocharged engine |
| WO2006058339A2 (en) * | 2004-11-29 | 2006-06-01 | Southwest Research Institute | Exhaust gas recirculation system with control of egr gas temperature |
| US20060266019A1 (en) * | 2005-05-26 | 2006-11-30 | Ricart-Ugaz Laura M | Low-pressure EGR system and method |
-
2005
- 2005-03-24 DE DE102005014264A patent/DE102005014264A1/en not_active Withdrawn
-
2006
- 2006-03-24 RU RU2007139107/06A patent/RU2410561C2/en not_active IP Right Cessation
- 2006-03-24 EP EP06723685.1A patent/EP1861608B1/en active Active
- 2006-03-24 KR KR1020077022310A patent/KR100901548B1/en active IP Right Grant
- 2006-03-24 PL PL06723685T patent/PL1861608T3/en unknown
- 2006-03-24 JP JP2008502335A patent/JP2008534835A/en active Pending
- 2006-03-24 CN CN2006800096065A patent/CN101146989B/en active Active
- 2006-03-24 WO PCT/EP2006/002702 patent/WO2006100090A1/en active Application Filing
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2007
- 2007-09-24 US US11/859,942 patent/US7490595B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29513957U1 (en) * | 1995-08-31 | 1997-01-09 | Robert Bosch Gmbh, 70469 Stuttgart | Exhaust pipe arrangement of an internal combustion engine, in particular for a combined heat and power plant |
Non-Patent Citations (1)
| Title |
|---|
| 全文. |
Also Published As
| Publication number | Publication date |
|---|---|
| US20080028747A1 (en) | 2008-02-07 |
| CN101146989A (en) | 2008-03-19 |
| PL1861608T3 (en) | 2014-07-31 |
| EP1861608B1 (en) | 2013-05-15 |
| EP1861608A1 (en) | 2007-12-05 |
| US7490595B2 (en) | 2009-02-17 |
| KR20070120116A (en) | 2007-12-21 |
| WO2006100090A1 (en) | 2006-09-28 |
| RU2410561C2 (en) | 2011-01-27 |
| JP2008534835A (en) | 2008-08-28 |
| KR100901548B1 (en) | 2009-06-08 |
| RU2007139107A (en) | 2009-05-20 |
| DE102005014264A1 (en) | 2006-09-28 |
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